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Evaluating wetland flow regulating functions using discharge time-series

✍ Scribed by V. U. Smakhtin; A. L. Batchelor

Book ID
102264576
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
170 KB
Volume
19
Category
Article
ISSN
0885-6087

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✦ Synopsis

Abstract

This paper describes a parsimonious approach for the evaluation of wetland hydrological functions, based on continuous observed streamflow records and flow duration curves. The functions evaluated are baseflow maintenance and flood attenuation, jointly referred to as ‘flow regulation’. The first step in this evaluation is to establish a reference hydrological condition. This condition is defined in terms of mean daily and instantaneous daily maximum flow time‐series and their corresponding duration curves, assuming that there is no wetland in the catchment. Further steps include calculating the changes of various flow percentiles, caused by the presence of a wetland, detailed hydrograph analysis, baseflow analysis and analysis of changes in characteristics of continuous flow events above and below specified threshold discharges. The method is illustrated using the observed streamflow data in the catchment of the Rustenburg wetland in South Africa. Copyright © 2004 John Wiley & Sons, Ltd.

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Daily streamflow time-series data are often in demand in water resource assessment, water quality and river ecology studies. Such studies normally require daily time-series representing the natural conditions in a catchment. The generation of these time-series by means of deterministic physically ba